1 /*- 2 * Copyright (c) 1997 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 27 * $FreeBSD: src/sys/dev/ppbus/if_plip.c,v 1.19.2.1 2000/05/24 00:20:57 n_hibma Exp $ 28 * $DragonFly: src/sys/dev/netif/plip/if_plip.c,v 1.12 2005/06/13 14:00:29 joerg Exp $ 29 */ 30 31 /* 32 * Parallel port TCP/IP interfaces added. I looked at the driver from 33 * MACH but this is a complete rewrite, and btw. incompatible, and it 34 * should perform better too. I have never run the MACH driver though. 35 * 36 * This driver sends two bytes (0x08, 0x00) in front of each packet, 37 * to allow us to distinguish another format later. 38 * 39 * Now added an Linux/Crynwr compatibility mode which is enabled using 40 * IF_LINK0 - Tim Wilkinson. 41 * 42 * TODO: 43 * Make HDLC/PPP mode, use IF_LLC1 to enable. 44 * 45 * Connect the two computers using a Laplink parallel cable to use this 46 * feature: 47 * 48 * +----------------------------------------+ 49 * |A-name A-End B-End Descr. Port/Bit | 50 * +----------------------------------------+ 51 * |DATA0 2 15 Data 0/0x01 | 52 * |-ERROR 15 2 1/0x08 | 53 * +----------------------------------------+ 54 * |DATA1 3 13 Data 0/0x02 | 55 * |+SLCT 13 3 1/0x10 | 56 * +----------------------------------------+ 57 * |DATA2 4 12 Data 0/0x04 | 58 * |+PE 12 4 1/0x20 | 59 * +----------------------------------------+ 60 * |DATA3 5 10 Strobe 0/0x08 | 61 * |-ACK 10 5 1/0x40 | 62 * +----------------------------------------+ 63 * |DATA4 6 11 Data 0/0x10 | 64 * |BUSY 11 6 1/~0x80 | 65 * +----------------------------------------+ 66 * |GND 18-25 18-25 GND - | 67 * +----------------------------------------+ 68 * 69 * Expect transfer-rates up to 75 kbyte/sec. 70 * 71 * If GCC could correctly grok 72 * register int port asm("edx") 73 * the code would be cleaner 74 * 75 * Poul-Henning Kamp <phk@freebsd.org> 76 */ 77 78 /* 79 * Update for ppbus, PLIP support only - Nicolas Souchu 80 */ 81 82 #include "opt_plip.h" 83 84 #include <sys/param.h> 85 #include <sys/systm.h> 86 #include <sys/module.h> 87 #include <sys/bus.h> 88 #include <sys/mbuf.h> 89 #include <sys/socket.h> 90 #include <sys/sockio.h> 91 #include <sys/kernel.h> 92 #include <sys/malloc.h> 93 #include <sys/thread2.h> 94 95 #include <machine/clock.h> 96 #include <machine/bus.h> 97 #include <machine/resource.h> 98 #include <sys/rman.h> 99 100 #include <net/if.h> 101 #include <net/ifq_var.h> 102 #include <net/if_types.h> 103 #include <net/netisr.h> 104 105 #include <netinet/in.h> 106 #include <netinet/in_var.h> 107 108 #include <net/bpf.h> 109 110 #include <bus/ppbus/ppbconf.h> 111 #include "ppbus_if.h" 112 #include <bus/ppbus/ppbio.h> 113 114 #ifndef LPMTU /* MTU for the lp# interfaces */ 115 #define LPMTU 1500 116 #endif 117 118 #ifndef LPMAXSPIN1 /* DELAY factor for the lp# interfaces */ 119 #define LPMAXSPIN1 8000 /* Spinning for remote intr to happen */ 120 #endif 121 122 #ifndef LPMAXSPIN2 /* DELAY factor for the lp# interfaces */ 123 #define LPMAXSPIN2 500 /* Spinning for remote handshake to happen */ 124 #endif 125 126 #ifndef LPMAXERRS /* Max errors before !RUNNING */ 127 #define LPMAXERRS 100 128 #endif 129 130 #define CLPIPHDRLEN 14 /* We send dummy ethernet addresses (two) + packet type in front of packet */ 131 #define CLPIP_SHAKE 0x80 /* This bit toggles between nibble reception */ 132 #define MLPIPHDRLEN CLPIPHDRLEN 133 134 #define LPIPHDRLEN 2 /* We send 0x08, 0x00 in front of packet */ 135 #define LPIP_SHAKE 0x40 /* This bit toggles between nibble reception */ 136 #if !defined(MLPIPHDRLEN) || LPIPHDRLEN > MLPIPHDRLEN 137 #define MLPIPHDRLEN LPIPHDRLEN 138 #endif 139 140 #define LPIPTBLSIZE 256 /* Size of octet translation table */ 141 142 #define lprintf if (lptflag) printf 143 144 #ifdef PLIP_DEBUG 145 static int volatile lptflag = 1; 146 #else 147 static int volatile lptflag = 0; 148 #endif 149 150 struct lp_data { 151 unsigned short lp_unit; 152 153 struct ifnet sc_if; 154 u_char *sc_ifbuf; 155 int sc_iferrs; 156 157 struct resource *res_irq; 158 }; 159 160 /* Tables for the lp# interface */ 161 static u_char *txmith; 162 #define txmitl (txmith+(1*LPIPTBLSIZE)) 163 #define trecvh (txmith+(2*LPIPTBLSIZE)) 164 #define trecvl (txmith+(3*LPIPTBLSIZE)) 165 166 static u_char *ctxmith; 167 #define ctxmitl (ctxmith+(1*LPIPTBLSIZE)) 168 #define ctrecvh (ctxmith+(2*LPIPTBLSIZE)) 169 #define ctrecvl (ctxmith+(3*LPIPTBLSIZE)) 170 171 /* Functions for the lp# interface */ 172 static int lpinittables(void); 173 static int lpioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 174 static int lpoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 175 struct rtentry *); 176 static void lp_intr(void *); 177 178 #define DEVTOSOFTC(dev) \ 179 ((struct lp_data *)device_get_softc(dev)) 180 #define UNITOSOFTC(unit) \ 181 ((struct lp_data *)devclass_get_softc(lp_devclass, (unit))) 182 #define UNITODEVICE(unit) \ 183 (devclass_get_device(lp_devclass, (unit))) 184 185 static devclass_t lp_devclass; 186 187 static void 188 lp_identify(driver_t *driver, device_t parent) 189 { 190 191 BUS_ADD_CHILD(parent, 0, "plip", 0); 192 } 193 /* 194 * lpprobe() 195 */ 196 static int 197 lp_probe(device_t dev) 198 { 199 device_t ppbus = device_get_parent(dev); 200 struct lp_data *lp; 201 int zero = 0; 202 uintptr_t irq; 203 204 lp = DEVTOSOFTC(dev); 205 bzero(lp, sizeof(struct lp_data)); 206 207 /* retrieve the ppbus irq */ 208 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 209 210 /* if we haven't interrupts, the probe fails */ 211 if (irq == -1) { 212 device_printf(dev, "not an interrupt driven port, failed.\n"); 213 return (ENXIO); 214 } 215 216 /* reserve the interrupt resource, expecting irq is available to continue */ 217 lp->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, irq, irq, 1, 218 RF_SHAREABLE); 219 if (lp->res_irq == 0) { 220 device_printf(dev, "cannot reserve interrupt, failed.\n"); 221 return (ENXIO); 222 } 223 224 /* 225 * lp dependent initialisation. 226 */ 227 lp->lp_unit = device_get_unit(dev); 228 229 device_set_desc(dev, "PLIP network interface"); 230 231 return (0); 232 } 233 234 static int 235 lp_attach (device_t dev) 236 { 237 struct lp_data *lp = DEVTOSOFTC(dev); 238 struct ifnet *ifp = &lp->sc_if; 239 240 ifp->if_softc = lp; 241 if_initname(ifp, "lp", device_get_unit(dev)); 242 ifp->if_mtu = LPMTU; 243 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 244 ifp->if_ioctl = lpioctl; 245 ifp->if_output = lpoutput; 246 ifp->if_type = IFT_PARA; 247 ifp->if_hdrlen = 0; 248 ifp->if_addrlen = 0; 249 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 250 if_attach(ifp); 251 252 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 253 254 return (0); 255 } 256 /* 257 * Build the translation tables for the LPIP (BSD unix) protocol. 258 * We don't want to calculate these nasties in our tight loop, so we 259 * precalculate them when we initialize. 260 */ 261 static int 262 lpinittables (void) 263 { 264 int i; 265 266 if (!txmith) 267 txmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 268 269 if (!ctxmith) 270 ctxmith = malloc(4*LPIPTBLSIZE, M_DEVBUF, M_WAITOK); 271 272 for (i=0; i < LPIPTBLSIZE; i++) { 273 ctxmith[i] = (i & 0xF0) >> 4; 274 ctxmitl[i] = 0x10 | (i & 0x0F); 275 ctrecvh[i] = (i & 0x78) << 1; 276 ctrecvl[i] = (i & 0x78) >> 3; 277 } 278 279 for (i=0; i < LPIPTBLSIZE; i++) { 280 txmith[i] = ((i & 0x80) >> 3) | ((i & 0x70) >> 4) | 0x08; 281 txmitl[i] = ((i & 0x08) << 1) | (i & 0x07); 282 trecvh[i] = ((~i) & 0x80) | ((i & 0x38) << 1); 283 trecvl[i] = (((~i) & 0x80) >> 4) | ((i & 0x38) >> 3); 284 } 285 286 return 0; 287 } 288 289 /* 290 * Process an ioctl request. 291 */ 292 293 static int 294 lpioctl (struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 295 { 296 device_t dev = UNITODEVICE(ifp->if_dunit); 297 device_t ppbus = device_get_parent(dev); 298 struct lp_data *sc = DEVTOSOFTC(dev); 299 struct ifaddr *ifa = (struct ifaddr *)data; 300 struct ifreq *ifr = (struct ifreq *)data; 301 u_char *ptr; 302 void *ih; 303 int error; 304 305 switch (cmd) { 306 307 case SIOCSIFDSTADDR: 308 case SIOCAIFADDR: 309 case SIOCSIFADDR: 310 if (ifa->ifa_addr->sa_family != AF_INET) 311 return EAFNOSUPPORT; 312 313 ifp->if_flags |= IFF_UP; 314 /* FALLTHROUGH */ 315 case SIOCSIFFLAGS: 316 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 317 318 ppb_wctr(ppbus, 0x00); 319 ifp->if_flags &= ~IFF_RUNNING; 320 321 /* IFF_UP is not set, try to release the bus anyway */ 322 ppb_release_bus(ppbus, dev); 323 break; 324 } 325 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 326 327 /* XXX 328 * Should the request be interruptible? 329 */ 330 if ((error = ppb_request_bus(ppbus, dev, PPB_WAIT|PPB_INTR))) 331 return (error); 332 333 /* Now IFF_UP means that we own the bus */ 334 335 ppb_set_mode(ppbus, PPB_COMPATIBLE); 336 337 if (lpinittables()) { 338 ppb_release_bus(ppbus, dev); 339 return ENOBUFS; 340 } 341 342 sc->sc_ifbuf = malloc(sc->sc_if.if_mtu + MLPIPHDRLEN, 343 M_DEVBUF, M_WAITOK); 344 if (!sc->sc_ifbuf) { 345 ppb_release_bus(ppbus, dev); 346 return ENOBUFS; 347 } 348 349 /* attach our interrupt handler, later detached when the bus is released */ 350 error = BUS_SETUP_INTR(ppbus, dev, sc->res_irq, INTR_TYPE_NET, 351 lp_intr, dev, &ih, NULL); 352 if (error) { 353 ppb_release_bus(ppbus, dev); 354 return (error); 355 } 356 357 ppb_wctr(ppbus, IRQENABLE); 358 ifp->if_flags |= IFF_RUNNING; 359 } 360 break; 361 362 case SIOCSIFMTU: 363 ptr = sc->sc_ifbuf; 364 sc->sc_ifbuf = malloc(ifr->ifr_mtu+MLPIPHDRLEN, M_DEVBUF, M_WAITOK); 365 if (ptr) 366 free(ptr,M_DEVBUF); 367 sc->sc_if.if_mtu = ifr->ifr_mtu; 368 break; 369 370 case SIOCGIFMTU: 371 ifr->ifr_mtu = sc->sc_if.if_mtu; 372 break; 373 374 case SIOCADDMULTI: 375 case SIOCDELMULTI: 376 if (ifr == 0) { 377 return EAFNOSUPPORT; /* XXX */ 378 } 379 switch (ifr->ifr_addr.sa_family) { 380 381 case AF_INET: 382 break; 383 384 default: 385 return EAFNOSUPPORT; 386 } 387 break; 388 389 case SIOCGIFMEDIA: 390 /* 391 * No ifmedia support at this stage; maybe use it 392 * in future for eg. protocol selection. 393 */ 394 return EINVAL; 395 396 default: 397 lprintf("LP:ioctl(0x%lx)\n", cmd); 398 return EINVAL; 399 } 400 return 0; 401 } 402 403 static __inline int 404 clpoutbyte (u_char byte, int spin, device_t ppbus) 405 { 406 ppb_wdtr(ppbus, ctxmitl[byte]); 407 while (ppb_rstr(ppbus) & CLPIP_SHAKE) 408 if (--spin == 0) { 409 return 1; 410 } 411 ppb_wdtr(ppbus, ctxmith[byte]); 412 while (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 413 if (--spin == 0) { 414 return 1; 415 } 416 return 0; 417 } 418 419 static __inline int 420 clpinbyte (int spin, device_t ppbus) 421 { 422 u_char c, cl; 423 424 while((ppb_rstr(ppbus) & CLPIP_SHAKE)) 425 if(!--spin) { 426 return -1; 427 } 428 cl = ppb_rstr(ppbus); 429 ppb_wdtr(ppbus, 0x10); 430 431 while(!(ppb_rstr(ppbus) & CLPIP_SHAKE)) 432 if(!--spin) { 433 return -1; 434 } 435 c = ppb_rstr(ppbus); 436 ppb_wdtr(ppbus, 0x00); 437 438 return (ctrecvl[cl] | ctrecvh[c]); 439 } 440 441 static void 442 lptap(struct ifnet *ifp, struct mbuf *m) 443 { 444 /* 445 * We need to prepend the address family as a four byte field. 446 */ 447 static const uint32_t af = AF_INET; 448 449 if (ifp->if_bpf) 450 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af)); 451 } 452 453 static void 454 lp_intr (void *arg) 455 { 456 device_t dev = (device_t)arg; 457 device_t ppbus = device_get_parent(dev); 458 struct lp_data *sc = DEVTOSOFTC(dev); 459 int len, j; 460 u_char *bp; 461 u_char c, cl; 462 struct mbuf *top; 463 464 crit_enter(); 465 466 if (sc->sc_if.if_flags & IFF_LINK0) { 467 468 /* Ack. the request */ 469 ppb_wdtr(ppbus, 0x01); 470 471 /* Get the packet length */ 472 j = clpinbyte(LPMAXSPIN2, ppbus); 473 if (j == -1) 474 goto err; 475 len = j; 476 j = clpinbyte(LPMAXSPIN2, ppbus); 477 if (j == -1) 478 goto err; 479 len = len + (j << 8); 480 if (len > sc->sc_if.if_mtu + MLPIPHDRLEN) 481 goto err; 482 483 bp = sc->sc_ifbuf; 484 485 while (len--) { 486 j = clpinbyte(LPMAXSPIN2, ppbus); 487 if (j == -1) { 488 goto err; 489 } 490 *bp++ = j; 491 } 492 /* Get and ignore checksum */ 493 j = clpinbyte(LPMAXSPIN2, ppbus); 494 if (j == -1) { 495 goto err; 496 } 497 498 len = bp - sc->sc_ifbuf; 499 if (len <= CLPIPHDRLEN) 500 goto err; 501 502 sc->sc_iferrs = 0; 503 504 len -= CLPIPHDRLEN; 505 sc->sc_if.if_ipackets++; 506 sc->sc_if.if_ibytes += len; 507 top = m_devget(sc->sc_ifbuf + CLPIPHDRLEN, len, 0, &sc->sc_if, 0); 508 if (top) { 509 if (sc->sc_if.if_bpf) 510 lptap(&sc->sc_if, top); 511 netisr_queue(NETISR_IP, top); 512 } 513 goto done; 514 } 515 while ((ppb_rstr(ppbus) & LPIP_SHAKE)) { 516 len = sc->sc_if.if_mtu + LPIPHDRLEN; 517 bp = sc->sc_ifbuf; 518 while (len--) { 519 520 cl = ppb_rstr(ppbus); 521 ppb_wdtr(ppbus, 8); 522 523 j = LPMAXSPIN2; 524 while((ppb_rstr(ppbus) & LPIP_SHAKE)) 525 if(!--j) goto err; 526 527 c = ppb_rstr(ppbus); 528 ppb_wdtr(ppbus, 0); 529 530 *bp++= trecvh[cl] | trecvl[c]; 531 532 j = LPMAXSPIN2; 533 while (!((cl=ppb_rstr(ppbus)) & LPIP_SHAKE)) { 534 if (cl != c && 535 (((cl = ppb_rstr(ppbus)) ^ 0xb8) & 0xf8) == 536 (c & 0xf8)) 537 goto end; 538 if (!--j) goto err; 539 } 540 } 541 542 end: 543 len = bp - sc->sc_ifbuf; 544 if (len <= LPIPHDRLEN) 545 goto err; 546 547 sc->sc_iferrs = 0; 548 549 len -= LPIPHDRLEN; 550 sc->sc_if.if_ipackets++; 551 sc->sc_if.if_ibytes += len; 552 top = m_devget(sc->sc_ifbuf + LPIPHDRLEN, len, 0, &sc->sc_if, 0); 553 if (top) { 554 if (sc->sc_if.if_bpf) 555 lptap(&sc->sc_if, top); 556 netisr_queue(NETISR_IP, top); 557 } 558 } 559 goto done; 560 561 err: 562 ppb_wdtr(ppbus, 0); 563 lprintf("R"); 564 sc->sc_if.if_ierrors++; 565 sc->sc_iferrs++; 566 567 /* 568 * We are not able to send receive anything for now, 569 * so stop wasting our time 570 */ 571 if (sc->sc_iferrs > LPMAXERRS) { 572 printf("lp%d: Too many errors, Going off-line.\n", device_get_unit(dev)); 573 ppb_wctr(ppbus, 0x00); 574 sc->sc_if.if_flags &= ~IFF_RUNNING; 575 sc->sc_iferrs=0; 576 } 577 578 done: 579 crit_exit(); 580 return; 581 } 582 583 static __inline int 584 lpoutbyte (u_char byte, int spin, device_t ppbus) 585 { 586 ppb_wdtr(ppbus, txmith[byte]); 587 while (!(ppb_rstr(ppbus) & LPIP_SHAKE)) 588 if (--spin == 0) 589 return 1; 590 ppb_wdtr(ppbus, txmitl[byte]); 591 while (ppb_rstr(ppbus) & LPIP_SHAKE) 592 if (--spin == 0) 593 return 1; 594 return 0; 595 } 596 597 static int 598 lpoutput (struct ifnet *ifp, struct mbuf *m, 599 struct sockaddr *dst, struct rtentry *rt) 600 { 601 device_t dev = UNITODEVICE(ifp->if_dunit); 602 device_t ppbus = device_get_parent(dev); 603 int err; 604 struct mbuf *mm; 605 u_char *cp = "\0\0"; 606 u_char chksum = 0; 607 int count = 0; 608 int i, len, spin; 609 610 /* We need a sensible value if we abort */ 611 cp++; 612 ifp->if_flags |= IFF_RUNNING; 613 614 err = 1; /* assume we're aborting because of an error */ 615 616 crit_enter(); 617 618 /* Suspend (on laptops) or receive-errors might have taken us offline */ 619 ppb_wctr(ppbus, IRQENABLE); 620 621 if (ifp->if_flags & IFF_LINK0) { 622 623 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 624 lprintf("&"); 625 lp_intr(dev); 626 } 627 628 /* Alert other end to pending packet */ 629 spin = LPMAXSPIN1; 630 ppb_wdtr(ppbus, 0x08); 631 while ((ppb_rstr(ppbus) & 0x08) == 0) 632 if (--spin == 0) { 633 goto nend; 634 } 635 636 /* Calculate length of packet, then send that */ 637 638 count += 14; /* Ethernet header len */ 639 640 mm = m; 641 for (mm = m; mm; mm = mm->m_next) { 642 count += mm->m_len; 643 } 644 if (clpoutbyte(count & 0xFF, LPMAXSPIN1, ppbus)) 645 goto nend; 646 if (clpoutbyte((count >> 8) & 0xFF, LPMAXSPIN1, ppbus)) 647 goto nend; 648 649 /* Send dummy ethernet header */ 650 for (i = 0; i < 12; i++) { 651 if (clpoutbyte(i, LPMAXSPIN1, ppbus)) 652 goto nend; 653 chksum += i; 654 } 655 656 if (clpoutbyte(0x08, LPMAXSPIN1, ppbus)) 657 goto nend; 658 if (clpoutbyte(0x00, LPMAXSPIN1, ppbus)) 659 goto nend; 660 chksum += 0x08 + 0x00; /* Add into checksum */ 661 662 mm = m; 663 do { 664 cp = mtod(mm, u_char *); 665 len = mm->m_len; 666 while (len--) { 667 chksum += *cp; 668 if (clpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 669 goto nend; 670 } 671 } while ((mm = mm->m_next)); 672 673 /* Send checksum */ 674 if (clpoutbyte(chksum, LPMAXSPIN2, ppbus)) 675 goto nend; 676 677 /* Go quiescent */ 678 ppb_wdtr(ppbus, 0); 679 680 err = 0; /* No errors */ 681 682 nend: 683 if (err) { /* if we didn't timeout... */ 684 ifp->if_oerrors++; 685 lprintf("X"); 686 } else { 687 ifp->if_opackets++; 688 ifp->if_obytes += m->m_pkthdr.len; 689 if (ifp->if_bpf) 690 lptap(ifp, m); 691 } 692 693 m_freem(m); 694 695 if (!(ppb_rstr(ppbus) & CLPIP_SHAKE)) { 696 lprintf("^"); 697 lp_intr(dev); 698 } 699 crit_exit(); 700 return 0; 701 } 702 703 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 704 lprintf("&"); 705 lp_intr(dev); 706 } 707 708 if (lpoutbyte(0x08, LPMAXSPIN1, ppbus)) 709 goto end; 710 if (lpoutbyte(0x00, LPMAXSPIN2, ppbus)) 711 goto end; 712 713 mm = m; 714 do { 715 cp = mtod(mm,u_char *); 716 len = mm->m_len; 717 while (len--) 718 if (lpoutbyte(*cp++, LPMAXSPIN2, ppbus)) 719 goto end; 720 } while ((mm = mm->m_next)); 721 722 err = 0; /* no errors were encountered */ 723 724 end: 725 --cp; 726 ppb_wdtr(ppbus, txmitl[*cp] ^ 0x17); 727 728 if (err) { /* if we didn't timeout... */ 729 ifp->if_oerrors++; 730 lprintf("X"); 731 } else { 732 ifp->if_opackets++; 733 ifp->if_obytes += m->m_pkthdr.len; 734 if (ifp->if_bpf) 735 lptap(ifp, m); 736 } 737 738 m_freem(m); 739 740 if (ppb_rstr(ppbus) & LPIP_SHAKE) { 741 lprintf("^"); 742 lp_intr(dev); 743 } 744 745 crit_exit(); 746 return 0; 747 } 748 749 static device_method_t lp_methods[] = { 750 /* device interface */ 751 DEVMETHOD(device_identify, lp_identify), 752 DEVMETHOD(device_probe, lp_probe), 753 DEVMETHOD(device_attach, lp_attach), 754 755 { 0, 0 } 756 }; 757 758 static driver_t lp_driver = { 759 "plip", 760 lp_methods, 761 sizeof(struct lp_data), 762 }; 763 764 DECLARE_DUMMY_MODULE(if_plip); 765 DRIVER_MODULE(if_plip, ppbus, lp_driver, lp_devclass, 0, 0); 766 767